Guozhu Chen

Publications (3)18.26 Total impact

• Article: Hollow ruthenium nanoparticles with small dimensions derived from Ni@Ru core@shell structure: synthesis and enhanced catalytic dehydrogenation of ammonia borane.

  Guozhu Chen, Stefano Desinan, Renzo Rosei, Federico Rosei, Dongling Ma
  [show abstract] [hide abstract]
  ABSTRACT: Hollow Ru nanoparticles with ~14 nm diameter and ~2 nm shell thickness are reported for the first time, by removal of Ni from the delicately designed Ni@Ru core@shell NPs. Such hollow Ru NPs exhibit enhanced catalytic activity in the dehydrogenation of ammonia borane with respect to solid ones.
  Chemical Communications 07/2012; 48(64):8009-11. · 6.17 Impact Factor
• Article: Synthesis of Ni-Ru alloy nanoparticles and their high catalytic activity in dehydrogenation of ammonia borane.

  Guozhu Chen, Stefano Desinan, Renzo Rosei, Federico Rosei, Dongling Ma
  [show abstract] [hide abstract]
  ABSTRACT: We report the synthesis and characterization of new Ni(x)Ru(1-x) (x = 0.56-0.74) alloy nanoparticles (NPs) and their catalytic activity for hydrogen release in the ammonia borane hydrolysis process. The alloy NPs were obtained by wet-chemistry method using a rapid lithium triethylborohydride reduction of Ni(2+) and Ru(3+) precursors in oleylamine. The nature of each alloy sample was fully characterized by TEM, XRD, energy dispersive X-ray spectroscopy (EDX), and X-ray photoelectron spectroscopy (XPS). We found that the as-prepared Ni-Ru alloy NPs exhibited exceptional catalytic activity for the ammonia borane hydrolysis reaction for hydrogen release. All Ni-Ru alloy NPs, and in particular the Ni(0.74)Ru(0.26) sample, outperform the activity of similar size monometallic Ni and Ru NPs, and even of Ni@Ru core-shell NPs. The hydrolysis activation energy for the Ni(0.74)Ru(0.26) alloy catalyst was measured to be approximately 37 kJ mol(-1). This value is considerably lower than the values measured for monometallic Ni (≈70 kJ mol(-1)) and Ru NPs (≈49 kJ mol(-1)), and for Ni@Ru (≈44 kJ mol(-1)), and is also lower than the values of most noble-metal-containing bimetallic NPs reported in the literature. Thus, a remarkable improvement of catalytic activity of Ru in the dehydrogenation of ammonia borane was obtained by alloying Ru with a Ni, which is a relatively cheap metal.
  Chemistry 04/2012; 18(25):7925-30. · 5.93 Impact Factor
• Article: Bifunctional catalytic/magnetic Ni@Ru core-shell nanoparticles.

  Guozhu Chen, Stefano Desinan, Riad Nechache, Renzo Rosei, Federico Rosei, Dongling Ma
  [show abstract] [hide abstract]
  ABSTRACT: Core-shell structured Ni@Ru bimetallic nanoparticles are demonstrated as a bifunctional nanoplatform system for the hydrolysis reaction of ammonia-borane and also for magnetic separation.
  Chemical Communications 06/2011; 47(22):6308-10. · 6.17 Impact Factor